Diseases
Leaf spot diseases are a group of fungal, bacterial, or viral disorders manifesting as tissue necrosis in the form of spots of various shapes and colors. Pathogen development leads to a reduction in photosynthetic leaf area, tissue deformation, and significant yield losses.
Mentioned in descriptions 15 926 varieties reference book.
Leaf spot diseases represent a collective group of conditions caused by fungi, bacteria, or viruses. The primary diagnostic symptom is the formation of spots of various colors—brown, yellow, black, or gray—on the leaf blades, ranging from small dots to extensive necrotic lesions with or without margins. Infection often originates in the lower leaf canopy and, if allowed to develop, leads to premature defoliation and overall plant weakening.
Disease progression depends on a combination of favorable meteorological factors, such as moderately warm temperatures and high humidity, as well as the agrotechnical background. Improper crop rotation and the retention of crop residues in fields contribute to the accumulation of inoculum and intensive infection of crops in subsequent seasons. The severity of disease manifestation correlates directly with pathogen aggressiveness and the degree of cultivar susceptibility, which can lead to a 20–30% or greater reduction in crop productivity.
Cultivar resistance to leaf spots is a genetically determined ability to maintain productivity under disease pressure. It can be specific, targeting particular pathogen races, or non-specific polygenic, providing complex protection. Resistance mechanisms include physical barriers, such as waxy coatings, and biochemical responses. During variety testing, resistance is evaluated under natural and artificial inoculation conditions using scoring scales to record the degree of necrosis and pathogen development.
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Hordeum vulgare L. · Barley
S. Zapryanov, T. Stefanov, Y. Burgazova, D. Lazarova, S. Navushtanov, N. Lazarov, V. Mincheva, N. Baleva, S. Staykova, P. Penchev
Phaseolus vulgaris L. · Common bean
NOVARTIS SEEDS
Lolium perenne L. · Perennial ryegrass
SEED RESEARCH OF OREGON
Beta vulgaris Sugar Beet Group · Sugar beet
Strube D&S GMBH
Hordeum vulgare L. · Barley
Danko Hodowla Roslin Sp.z.o.o.
x Triticosecale Wittm. ex A. Camus · Triticale
Bona Lajos / Matuz Janos / Beke Bela / Purnhauser Laszlo / Cseuz Laszlo / Juray Antal / Petroczi Istvan
Beta vulgaris Sugar Beet Group · Sugar beet
KWS SAAT SE and CO KGAA
Triticum aestivum L. · Bread wheat
Csoesz Laszlone / Matuz Janos / Kertesz Zoltan / Pusztai Laszlone / Falusi Janos / Schulcz Jozsefne / Beke Bela / Pauk Janos / Sandor Zoltan / Cseuz Laszlo
Arachis hypogaea L. · Peanut
North Carolina Agricultural Research Service
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Cucumis sativus L. · Cucumber
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Sakata Vegetables Europe, F
Hordeum vulgare L. · Barley
Nordic Seed A/S
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Triticum aestivum L. · Bread wheat
RAGT CZECH S.R.O.
Spinacia oleracea L. · Spinach
NUNHEMS
Beta vulgaris Sugar Beet Group · Sugar beet
KWS, D
Triticum aestivum L. · Bread wheat
Lietuvos agrarinių ir miškų mokslų centras
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
x Festulolium Aschers. et Graebn. · Festulolium
ILVO-PLANT 39
Festuca rubra L. · Red fescue
RUTGERS UNIVERSITY OF NEW JERSEY
Spinacia oleracea L. · Spinach
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
Solanum lycopersicum L. · Tomato
Monsanto Vegetable, NL
Solanum lycopersicum L. · Tomato
Syngenta Seeds B.V.